We launched an iOS app last year that have around 30,000 users on a Mixpanel project. We are building a complete new version of our app and set up a new Mixpanel project for it. We will soon import all our users in the backend from the first version to the new one and I'm trying to understand what would be the best option to set all the users informations as they will not go through a sign up process and I can't do .alias() on the frontend.
What would be the best solution in this case? Should I try to merge user informations from our previous Mixpanel project or is there a way to do .alias() when we move users from our two databases?
Thanks a lot for your help,